Nitrogen-fixing bacteria live in the root nodules and take atmospheric nitrogen out of the air and convert it to ammonia in the soil. The ammonia is then converted into nitrates and nitrites by nitrifying bacteria in the soil for plants to use through the process of assimilation. The bacteria in the nodes have a mutualistic relationship with the bean plant because they provide it with the essential nitrites and nitrates by performing ammonification.
Answer:
As far as I remember, the answer should be: Elliptical galaxies have no spiral arms.
Explanation:
Hope am right and hope this helps
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Genetic drift is defined as a shift in the allelic frequency of a population. This can be caused by natural selection which is the differential survival and reproduction of individuals across a population due to differences in phenotype. Natural selection favors particular traits in a population hence these individuals are able to reproduce while the individuals with disadvantageous traits will pass their genes to succeeding generations. This way the allelic frequency of succeeding generation will be diferent from that of the parent population.
Because the heads are polar/hydrophilic so they will be attracted to the water which is also polar whereas the tails are non-polar/hydrophobic so they will avoid the water at all cost.
Gradient should be in the blank, hope that helps